<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let arr = [15,19,21,33,18,24]
        let avg = 0
        let sum =0
        for(let i =0;i<arr.length;i++){
            const a = arr[i]
        sum=a+sum
        }console.log(`平均分是${sum / arr.length}`)
    </script>
</body>
</html>